TCP_SNDLOWAT macro

TCP_SNDLOWAT: TCP writable space (bytes). This must be less than TCP_SND_BUF. It is the amount of space which must be available in the TCP snd_buf for select to return writable (combined with TCP_SNDQUEUELOWAT).

Syntax

from opt.h:1331

#define TCP_SNDLOWAT LWIP_MIN(LWIP_MAX(((TCP_SND_BUF)/2), (2 * TCP_MSS) + 1), (TCP_SND_BUF) - 1)

References

Location	Text
opt.h:1331	#define TCP_SNDLOWAT LWIP_MIN(LWIP_MAX(((TCP_SND_BUF)/2), (2 * TCP_MSS) + 1), (TCP_SND_BUF) - 1)
api_msg.c:380	if ((conn->pcb.tcp != NULL) && (tcp_sndbuf(conn->pcb.tcp) > TCP_SNDLOWAT) &&
api_msg.c:414	if ((conn->pcb.tcp != NULL) && (tcp_sndbuf(conn->pcb.tcp) > TCP_SNDLOWAT) &&
api_msg.c:1735	} else if ((tcp_sndbuf(conn->pcb.tcp) <= TCP_SNDLOWAT) \|\|
init.c:305	#if TCP_SNDLOWAT >= TCP_SND_BUF
init.c:308	#if TCP_SNDLOWAT >= (0xFFFF - (4 * TCP_MSS))